Allowed characters in filename

What are the allowed and forbidden character in file name ? The POSIX “Fully portable filenames” lists the following characters:

  • Alphabet upper case letters : A B C … Z (not recommended, see below)
  • Alphabet lower case letters : a b c … z
  • Numbers : 0 1 2 … 9
  • Dot : .
  • Underscore : _
  • Minus :

Hyphen must not be first character (_ . -).

Example :

FileName_01-03-16.txt

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The app check_file_name renames all the files and folders in every sub directories.

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